Cooling apparatus



June 29 1926. 1,590,513

G. E. l-luLsEv COOLING- APPARTUS. Filed Feb. 8, 1922 3 Sheets-Sheet 1 fr; 54 zo TToRNgys G. E. HULSE COOLING APPARATUS Filed Feb. 8. 1922 June -29 1926.

'5 SheetsLShevet 2 "#7" RNEY INVENTGR 5'.

BY-W l ATTO June 29 1926.1

G. E. HULsE COOLING APPARATUS Filed eb. Aa, 1922 3 Sheets-Sheet :5

ATTORNEY above typ Patented. June 29, 1926.

y UNITED STATES PATENT. OFFICE.

GEORGE E. HULSE, 0F NEW HAVEN, CONNECTICUT, ASSIGNOB TO SAFETY CAB HEAT- f ING LIGHTING COHPAN Y, A CORPORATION Ol' NEW JERSEY.

COOLING APPARATUS.

Application illed February 8, 1922. Serial lo. 584,878.

This invention relates to cooling apparatus and more particularly to apparatus for cooling drinking water and the like. Que of the objects of this invention is to provlde a practical and reliable apparatus of the e and having a reliable and efficient action. Another object is to provide apparatus' of the above character in which the several elements are so related mechanically, and in which the mechanical as.

well as refrigerating or cooling action there- 1 -of may take place in such manner, that a substantially unitary and self-contained structure is attained. Another object is to (provide a reliable and 'effective system ofubrication for apparatus of the above-na- ,ture. Another object is to provide a ractical arrangement for mountingan corelating the several elements to provide the -above mentioned unitary and self-conta'ned mechanical structure. Other objects'will be in part obvious and in part pointed out.

hereinafter. U

The invention accordingly consists in the features of construction, combination of ele- .mentsand arrangement of parts which will y be exemplified in the structure hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which is shown one of various possible embodiments of this invention,

Figure 1 is a vertical central section of the lower portion of the apparatus showing the driving motor compressor and related parts in assembled relation with respect to one another; and

Figure 2 is a similar vertical central section of the upper portion of the apparatus vshowing' the reservoir and certain related parts.

Figure 3 is a plan view on a smaller scale of a receiver, certain portions being broken away to show certain features more clearly; and

Figure 4 is a'side elevation, partl broken away, of the receiver as viewed rom the left in Fig. 3.

Figure 5. is a detailed View partly in section of an expansion device;

Figure 6 is-an end view; and

Figure 7 is'a vertical cross-section on the scale the construction of an expansion unit formin part of the expansion device illustrated 1n Fig. 5. Similar reference characters refer to similar parts throughout the several views of the drawings.

Referring now to Fig. 1 ofthe drawings, there is shown at 10 the main frame or field frame of an electric motor, the lower end being provided with suitable outwardly directed lugs 11 adapted to form a standard or base for supporting the motor frame 10 in a vertical position. A suitable number of lugs 11 are provided to form a rigid support or base and suitable openings are provided in the lower end ofthe frame and intervening the lugs 11 for a purpose to be hereinafter more clearly set forth. The field frame 10 is rovided with a lower or end piece 12 pre erably Aintegrally formled therewith and terminating in a. housing 13 in which is adapted to be received the outer race 14 of a combined radial and thrust ball bearing whose inner race- 15 is suitably mounted and secured to the lower end of the armature shaft-16 of the motor, thereby forming a supportV for one end of the rotatable part of the motor. The housing 13 is interiorly threaded to receive the exteriorly threaded cap 17 whose inner end is adapted to engage and support the outer ball race 14 which, as will be clear from the foregoing, fits snugly within the cylindrical housing 13. The ball race-14 and with it the entire ball bearing andthe armature shaft 16 may thus be not only readily assembled but also readily and conveniently adjusted in an axial direction by means of the threaded cap 17 whose position within the housing 13 may be fixed after adjustment by means of suitable screws 18 threaded into the end of the housing 13 and extending through suitable serrations in the outer periphery of the flanged portion of the cap 17.

Turning now to the support for the other end of the armature shaft 16 it will be noted that the field frame 10 of the motor is provided. with a plurality v of upwardly and ably formed integrally with the vertical arms i9 is adapted to support a spider having a ring portion 21 machined to fit the surfaces of the ring 20. Screws may be employed to secure these parts together. The spider is provided with a plurality of arms, two of which are shown in elevation at 22 and 23 and terminate in a centrally posi. tioned and substantially cylindrical housing 24 in the lower end of which is mounted a ball bearing indicated generally at 25. the outer race 26 fitting within the lower inte-` rior of the housing 24. The interior race 27 of the ball bearing is fitted upon a sleeve 28 which is downwardly extended so as to receive within its lower end the upper end 16n of the armature shaft 16. The latter is rigidly connected with the sleeve 28 so as to form a driving connection by means ofy the pin 29 lpassing through the lower end of the sleeve" 28. The upper end of the armature shaft 16 is thus rigidly supported and it will be noted that upon adjustment in an axial direction of the armature shaft by means of the threaded cap 17 hereinbefore described the sleeve 28 with its associated ball bearing 25 may partake of a like movement, the housing 24 being suitably machined at its lower interior end as at 30 to permit of a movement in an axial direction of the upper supportingY ball bearing 25. l i "hr2 The sleeve 28 is flanged at its upper end as at 31 so as to hx the position of the inner race 27 of the ball bearing and the latter is held in such position by the hub 32 of a. fan

`indicated generally at 33, the hub 32 being threaded upon the sleeve and against the inner ball race 27 to securely lock the latter in position. A nut 34 is provided for lockthe hub 32 of the fan 33 in position upon the sleeve 28. It will be noted that the construction above described thus permits Vof a convenient and ready assembly of the several parts.

It may at this point be noted that the fan 33, being thus rigidly mounted upon the shaft 16 of the motor being driven thereby, is effective to draw air downwardly between the arms 22 and 23 of the supporting spider for a purpose to be more clearly set forth hereinafter and thereupon discharges the air outwardly between the supporting arms 19 and downwardly through the effective or operative portions of the motor. The armature indicated generallv at 35 and its associated field windings indicated generally at 36 are thus provided with an effective cooling current of air, which may thereupon exit through the lower end of the field frame 10 and through the spaces the interior end of the housing 13 whereby, together with the adjusting cap 17, the ball bearing supporting the lower end of the shaft 16 is substantially entirely encased and thus protected from dust and foreign matter which may be directed thereto by the current of air or otherwise.

The motor may be supplied with current from any suitable source, as for example a. storage battery 39, and the circuit of the motor comprising the conductors 40 and 41 and hence the operation thereof is preferably oontrolled by means hereinafter to be more clearly described.

Taking up now in detail the cooling apparatus there is shown and generally indicated at 42 a compressor preferably of the rotary type mounted upon the flanged portion 43- and preferably integral with an upwardly direeted extension 44 of the housing 24 hereinbefore described. The compressor 42 is preferably built up upon the anged end 43 of the housing 44 and may comprise for example the substantially cylindrical wall portion 45 and an end or closing platr- 46 secured together as by means of the bolts 47. The end plate 46 has an upwardly directed cylindrical extension 48 into the lower end of which the outer race 49 of a ball bearing generally indicated at 50 is adapted to be litted. The inner race 51 is secured in any suitable manner to the upper end of the shaft 52 ofthe compressor. A cap 53 is threaded onto the cylindrical extension 48 of the end plate 46 and is adapted to close the bearing housing formed b the extension 48. The several parts forming the casing for the compressor 42 may be accurately machined so that when fitted upon the flanged portion 43 of the housing 44 supported by the spider arms 22 and 23 and placed in assembled relation as shown in Fig. 1. the upper ball bearing 42 will be in axial alignment with the lower ball bearing 25 which, as hereinbefore described, is by the construction employed also in alignment with the lowermost ball bearing 14-15.

The compressor shaft 52 is extended downwardly and is in driving connection with the motor shaft 16 as follows. In the upper end of the sleeve 28 there is pivotally supported a block 54 of a substantially rectangular cross-section. the block 54 being held in position by means of the pin 55 passing through it and through the sleeve 28. The lower end of the compressor shaft 52 is milled out as at 56 to provide an axially extending slot in the lower end thereof into which the block 54 may be received. The milled portion or slot 56 is. moreover. of sufficient extent so as to permit of a relative movement or sliding action to take place between the lower forked end of the shaft 52 and the sleeve 28 within which the lower 'end of the shaft 52 is received. The milled or slotted portion 56 of the shaft thusnot only insures a positive driving connection between the compressor shaft 52 and the motor shaft 16 but also permits of an axial adjustment of the motor shaft 16 by means of the cap 17 hereinbefore described to take place without affecting the compressor shaft 52 and its upper mounting. Furthermore, it may also be noted that the lower or forked end of the shaft 52 which straddles the block 54 preferably fits snugly within the sleeve 28 so that the lower end of the compressor shaft 52 is supported thereby and so that the ball bearing 25, supporting the upper end of the motor shaft 16 also forms the roller bearing for the compressor shaft 52.

The compressor 42 on being operated is adapted to compress, as will be more clearly set forth hereinafter, a volatile and condensible gas, such for example as sulphur dioxide, and in order to provide for adequate lubrication of the moving parts of the compressor a suitable lubricant having a different specific gravity from that of the sulphur dioxide is used and may, for example, take the form of a suitable petroleum oil. In order to prevent the leakage of the liquefied gas and lubricant downwardly and into the motor and its operative parts there is associated with the compressor and its driving shaft a suitable seal. This seal comprises in part a bushing 57 having suitably secured to its interior a corrugated expansible tube 58. The bushing 57 is adapted to be threaded into the housing 44 and the threaded connection indicated at 59 is made tight by means of a suitable packing or washer 60 interposed between the fianged end of the bushing 57 and a suitable shoulder on the interior of the housing.r 44. The interior diameter of t-he expansible tube 58 is materially greater than the diameter of the shaft 52 and is adapted to encase the latter, as is clearly shown in Fig. 1 of the drawings. At the lower end of the expansible tube 58 there is rigidly secured thereto a collar 61 shaped to form a housing for a second collar 62, which latter is preferably formed of a material of good wearing qualities such as steel for example and whose interior diameter is such as to permit the shaft 52 to rotate therein. The lower end face of the collar 62 indicated at 68 is accurately machined or surfaced to form a close fit with the upper end face of the sleeve 28 which preferably is also made of a material of good wearing qualit-ies such as steel for example.

The lower end face 68 of the collar 62 which, as above noted, is fixed against rotation by its engagement with the collar 61 is held in tight contact with the upper end face of the sleeve 28 by reason of the tendency of the corrugated tube 58 to expand thus preventing any leakage which may take place between the shaft 52 and the collar 62 from escaping to the exterior. Furthermore, sufficient hquid including lubricant will be supplied to the relatively moving end faces of the seal-forming collar 62 and sleeve 28 to effectively lubricate these surfaces against excessive wear. Any leakage that findsy its way downwardly into the sleeve 28 is prevented from lreaching the exterior or the moving parts of the apparatus by means, of a diaphragm indicated at. 64 in the interior of the sleeve 28 and interposed between the ends of the compressor shaft 52 and of the motor shaft 16. The diaphragm or seal 64 may be made of any suitable material such as, for example, lead or copper, and may be expanded by hammering for example into proper sealing position, a suitable circumferentially extending groove indicated at 65 'being provided on the interior of the sleeve :Ihe tightness of the seal formed by the collar 62 and the end face of the sleeve 28 nray be adjusted by adjusting the position of the motor shaft 16 and hence of the end face of the sleeve 28 in an axial direction by means of the adjusting cap 17 hereinbefcre described.

The compressor 42 discharges the gas under relatively high pressure through the tube 66 from which it passes throughout an inner coil 67 and an outer coil 68 of a condenser. A series of copper sheet-s, indicated generally at 22L and spaced from one another in a 'preferably radial manner, are fitted about the coils 67 and 68 and serve as cooling flanges for bringing about a more effective cooling of the fluid passing through the coils. The condenser coils and their associated cooling flanges form a substantially compact and annularly shaped condenser which preferably surrounds the compressor and is suitably supported upon the arms 22 and 23 of the supporting spider hereinbefore described. The fan whose action has been hereinabove briefly described is efi'ective to draw a current of air downwardly through the condenser and over the cooling flanges, thus making more effective the action of the condenser in condensing the compressed gas into liquid form. The liquefied 115 gas passes from the condenser through the connecting tube 69 to an annular receiver 70 surrounding the condenser coils 67 and 68 and suitably supported upon the ring portion 21 of the supporting spider. The 120 receiver in being thus positioned is also affected by a. current of air drawn through the condenser which it surrounds and the cooling is thus made highly effective.

In the receiver 70 the liquid is permitted 125 to accumulate and since as above noted the compressor is supplied with a suitable lubricant, a material quantity of the lubricant will pass off with the gas and with the gas will accumulate in the receiver 70. The lu- 130 In Figs. 3

bricant and the condensed gas, however, are of different specific gravities and hence a separation may take place within the receiver 70. One of the features of this invention resides in the provision of means for bringing about an effective separation of the lubricant from the condensed gas.

and 4 of the drawings the receiver is shown on a smaller scale and it will be noted that adjacent the tube 69 through which the mixed' lubricant and condensed gas is discharged from the condenser into the receiver" 70 there is provided a downwardly extending baffle plate 71 extending laterally between the two annular walls of the receiver 70 and extending downwardly, as more clearly shown in Fig. 4, to contact with the bottom of the receiver 70. Owing to the differing specific gravities of the lubricant and the condensed gas. and assuming that sulphur dioxide and oil are employed as above noted, the sulphur dioxide, being of greater specific gravity than the lubricant or oil, will separate into a lower stratum indicated at 7 2 and the lubricant will accumulate in an upper stratum indicated at TIS. The baffle plate 7l extends downwardly to the bottom of the receiver and with the walls of the receiver forms a substantially annular path of flow from one side of the plate 71 to the other side. On this other side of thebaflie plate there extends a tube 74 in an upward direction, as is clearly shown in Fig. 4, and to such extent as to extend into the upper stratum 73 of lubricant, in order to permit the latter to be withdrawn. The condensed gas in the stratum 72 is withdrawn from the receiver by the tube positioned adjacent the baiiie 71 but on that side thereofopposite the inlet tube 69, and has a portion 7 5a extending downwardly into the receiver and into the lower stratum 72 of condensed gas. The tube 74 (Fig. 4) is extended so as to enter a cap 53 (see Fig. l) at the upper end of the compressor housing so as to withdraw the lubricant from the stratum 73 and supply it to the moving parts of the compressor.- A member 74a is detachably mounted in the cap 53 and is provided with a suitable orifice which serves to limit the flow of lubricant to the desired extent.

Considering now the action of separation which takes place in the receiver, it will be noted that the mixed condensed gas and lubricant have to pass circumferentially or throughout the entire extent of the annular path provided by the concentric walls of the receiver in order to get from the inlet side of the baffle plate 7l to the other or out-let side thereof. The mixed fiuids thus have to travel throughout their relatively great path and there is thus allowed a sufliciently great length of time during this passage for an effective separation by gravity to take place.

As the mixed liquids continue their travel throughout the path provided therefor by the receiver, the separation becomes progressively more complete so that by the time thev condensed gas and the lubricant have reached theoutlet side of the bafile plate 71 the two strata 72 and 73 are well defined. From these two strata the sulphur dioxide and the lubricant are withdrawn by the tubes 75a and 74 respectively.

It may also be noted that this construction permits the desirable concentration of the connecting tubes or conduits at substantially a single point and thus makes'for a more compact construction.

Considering now the steps in the cycle through which the cooling gas passes, the condensed gas after being withdrawn from the lower stratum 72 through the tube 75B passes through an expansion device compris ing a plurality of expansion units or orifice members which are preferably housed in serial relation in the tube 75. Thus, referring to Fig. 5, there is shown a section of the tube 75 in which are fitted a plurality of expansion units 76 each provided with an orifice 77. Referring to Figs. 6 and 7 in which the construction of a single expansion unit is shown on enlarged scale, it will be seen that each unit 76 comprises preferably a substantially cylindrical chamber forming portion 7 6 open at one end and closed at the other by means of the end wall 76b in which the orifice 77 is substantially centrally positioned. Turning now to Fig. 5 it will be seen that when a plurality of such expansion units 76 are arranged serially within the tube 7 5 there is formed a series of expansion chambers separated, adjacent chambers being connected through the orices of the preceding unit. Thus the expansion from a relatively high pressure to a relatively low pressure to bring about the desired reduction in pressure takes place in a series of successive expansions through a series of orifices whose dimensions may be sufficiently large to prevent foreign matter from clogging the orices and from affecting the operation of the apparatus. The drop in pressure between adjacent expansion chambers or units is relatively small since the orifices employed are as above noted of materially large dimensions, vbut the drop in pressure and hence the drop in temperature between the first and the last expansion is relatively great. The desired drop in temperature is thus obtained with larger expansion orifices than would be necessary were the entire expansion to( take place through a single orifice. The operation of the expansion device is thus made highly vdependable and reliable.

. The provision, furthermore, of a plurality of serially arranged orifices permits the flow of refrigerating liquid throughout the entire cycle to be readily maintained wi'thina predetermined limit dependent upon the rate at which the cooling is intended to be carried on. For example, with a given size of orifice, the rate of flow for the desired rate of cooling may be governed by the number of expansion units employed.

Furthermore, it should be noted that each expansion unit 76 is of simple Mconstruction and may, for example, be readily stamped or punched out of sheet metal thus insuring an inexpensive cost of manufacture. It should also be lnoted that the series of cxpansion units are readily assembled or placed in serial relation within the tube 75 which preferably forms one of the usual pipe or tube connections and thus additional tubing and complications are avoided. The tube 75, furthermore, in which the eXpansion units are mounted may readily be bent, if desired, to form the desired connections without impairing the action of the expansion devices therein positioned.

After passing from the receiver 70 through the expansion units 76 in the tube 75, the expanded gas is led by the tube 7 5 (see Fig. 2) to a coil 78 whose other end terminating in the tube 79 is connected to the inlet side of the compressor 42 (see Fig. 1),

Vthrough an extension of the tube 79.

The coil 78 is mounted within a suitable sheet metal container 80 insulated upon its exterior by means of a suitable heat-insulating material 81 suitably supported in relation thereto as by means of the sheet metal casing 82 supported in turn upon a suitable base 83. The sheet metal container 8O and the casing 82 are adapted to support a collar 84 formed at its upper end to receive a rubber ring 85 in which may be rested an inverted water bottleindicated fragmentarily at 86. The container 80 is preferably tapered as shown in Fig. 2 of the drawings, and

the coil 78, similarly tapered, is r'encased inl a suitable material of relatively hi h heatconductivity, such as for exainp e lead.

Thus, as indicated in Fig. 2 of the drawings, the coil 78 is imbedded or packed in lead as indicated at 87 thus forming an interior lining for the container 8O and substantially similarly tapered. There is thus formed a chamber whose interior walls are substantially continuous and unbroken surfaces and of sanitary construction. Furthermore, the spaces that would otherwise intervene the turns of the coil 78 are avoided so that the accumulation of foreign matter therein is effectively precluded.

The tapered chamber thus formed as above described isI adapted to receive a substantially similarly tapered receptacle 8Oa fitting snugly therein so that the walls of the receptacle 80 are in snug contact with the highly heat-conductive lining 87 in which the coil 78 is imbedded. From the water bottle 86 the water will accumulate in the receptacle" rial 81 interposedA therebetween. Upon the outer end of the tube 91 may be mounted a suitable faucet for withdrawing the water as desired from the receptacle 80. The faucet with its connecting tube 91 may be readily removed by unscrewing from the bushing 80b upon the interior of the rece tacle 80il so that the receptacle 8()a may e readily removed for purposes of cleanin both the receptacle and the interior parts o the cooling apparatus.

In order to maintain the cooling action of the apparatus substantially uniform and to maintain such action within desirable limits there is mounted in the lower part of the container 80 a thermostatic vessel 88 whose construction is preferably substantially conical in shape, as shown in Fig. 2 of the drawings. The substantially conically shaped vessel 88 provides a suitable interior chamber from which a tube 89 leads to a pressure-controlled switch indicated diagrammatically at 90 and adapted to control the circuit of the motor. Thus, in Fig. 2 of the drawings'the conductors 40 and 41 of the electric circuit of the motor are brought to the switch 90 to open or close the circuit in accordance with the fall or rise of temperature of the water within the receptacle 80 between predetermined limits.

As the thermostatically controlled switch forms no part of this invention it has been merely diagrammatically illustrated, andas for the details thereof reference ma be had by way of example to my co-pen ing application filed Februar 15, 1922, Serial No. 536,611; It may brie y be noted, however, that the pressure-controlled switch indicated diagrammatically at 90 is adapted to be responsive to changes in pressure, for example ofa suitable fiui as a result of the, changes of temperature taking place within the thermostatic vessel 88. According to one of the features of this invention, means are pros videdV for maintaining the thermostatic vessel 88 in intimate thermal contact with the receptacle 80, and referring to Fig. 2 of the drawings it will be seen that the vessel 88 is of conical exterior shape and that the bottom 80 of the receptacle 80* is also of conical shape. The vessel 88- is supported upon` the abutment 92 to which it is connected by means of a spring 93 tending to urge the vessel 88 in an upward direction. The tube 89 connecting the ressure-o erated switch 90 with the vesse 88 may e of any suitable flexible construction to permit the movement of the vessel 88 to take place in response to the action of the spring 93.

The receptacle on being inserted within the lined container 8O is, as above noted,

laced in intimate contact with the lining 87 1n which the cooling coi1'78 is imbedded, and since the coacting walls are tapered the snug Contact thereof is assured to bring the parts in intimate thermal relation. Furthermore, upon the insertion of the receptacle 80iL the thermostatic vessel 88 is automatically seated within the cone-sha ed bottom 80 of the receptacle and is hel not only in such seated osition but also in close contact with the ttom of the receptacle in response to the action of the sprin 93. The thermostatic vessel 88 is thus a so maintained in intimate contact with the water to be cooled so that the action of the switch 90 may .be accurately andv reliably controlled thereby.

It will thus be noted that there has been provided in this invention an apparatus in which the several objects above set forth, as Well as others, are attained and in which many advantages are successfully achieved. It will furthermore be noted that there has been provided apparatus in which the several parts may be readily and accurately assembled for operation and that when so assembled a unitary and substantially selfcontained cooling apparatus is provided. Furthermore, the several parts are of rugged construction and are of convenient and ready adjustment for most effective mechanical operation. It may also be noted that there has been provided apparatus of an exceedingly practical construction conducive to inexpensive manufacture and durable and rugged operation when in'use.

I make no claim herein to the structural features per se of my invention relating to the prime mover and condenser, having made the latter features of my invention the subject-matter of a divisional application, Serial No. 753,924, filed December 4, 1924; nor do I make herein specific claim to the structural features per se illustrated in Fig. 2 herein, having made such features the subject-matter of a divisional application, Serial No. 7 53,925, filed December 4, 1924.

As many possible embodiments might be made of the aboveinvention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinafter set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

I claim as my invention:

1. In apparatus of the nature of that herein described, in combination, a compressor, a condenser connected to receive condensed fluid and lubricant from said compressor, a receiver providing an annular path of ow adapted to receive con' said separated lubricant to the moving parts of said compressor.

2. In apparatus of the nature of that herein described, in combination, a compressor, a condenser adapted to receive compressed fluid and lubricant from said compressor, a substantially annularly shaped y receiver having a connection with said condenser for receiving condensed fluid and lubricant therefrom and adapted to permit the separation of the lubricant from the condensed fluid to take' place therein, an outlet positioned adjacent said intake con nection for discharging the separated condensed iiuid from said receiver, means interposed between said outlet and said intake connection adapted to cause said iuids to travel throughout substantially the entire extent of said annularly shaped receiver, and means adapted to return the separated lubricant to the moving parts of said compressor and connected to said receiver substantially adjacent said outlet.

3. In apparatus of the nature of that herein described, in combination, a compressor,.a condenser adapted to receive compressed iuid and lubricant from said compressor, a receiver having two substantially circular, concentric and spaced walls and having an inlet connection for receiving condensed fluid and lubricant from said condenser, a bale plate interposed between said concentric Walls of saidl receiver and positioned adjacent said inlet connection, an outlet connected to said receiver adjacent said battle plate and on the side thereof remote from said inlet connection for withdrawing condensed iuid from said receiver, and a second outlet positioned in proximity to said outlet connection and on the side of said balile plate remote from said inlet connection for returning separated lubricant to said compressor, said baffle plate causing said condensed iuid and lubricant to travel from one side of said baiiie plate throughout substantially the entire extent of the annular path provided by said concentric walls of said receiver to said outlet connections on the other side of said baffle plate whereby a separation of the lubricant from said condensed Huid may take place.

4. In apparatus of the nature of that herein described, in combination, a plural- 1ty of expansion units each made of sheet metal and shaped to provide an elongated cylindrical chamber forming portion having llO 'end and adapte one end open and a closing wall portion provided With an ex ansion orifice at the other to be arranged in axial alignment, and means for retaining said units" in axial alignment.

5. In apparatus of the nature of that herein described, in combination, a plurality of serially arranged expansion units each comprising a 'sheet metal member stamped to form a substantially cylindrical chamber forming portion open at one end and having-a closing Wall portion provided WithY a substantially centrally positioned oriice-,atthe other end, and asubstantially cylindrical casing for mounting and retaining said units in serial relation.

6. In apparatus of the nature of that herein described, in combination, a motor -having a frame provided With vertically extending supporting arms, a compressor driven by said motor, a condenser coil for receiving compressed fluid from said compressor and a curved receiver for receiving condensed fluid from said condenser, said condenser coil and said receiver being arranged concentrically and supported by said arms, and means driven by said motor for passing a cooling fluid in thermal contact With said condenser. A

7. In apparatus of the nature of that herein described, in combination, a motor having a vertically extending driving shaft and having a frame provided With vertically extending supporting arms, a fan on said motor shaft and positioned Within said supporting arms, a compressor driven from said motor shaft, acondenser coil for receiving compressed fluid from said compressor, a curved receiver for receiving condensed fluid from said condenser, said condenser coil Vand said receiver being arranged substantially concentrically, and means for supporting said compressor, said condenser coil and said receiver from saidv supporting arms, said condenser being thereby positioned to be affected by said fan.

8. In apparatus of the nature of that herein described, in combination, a motor having a vertically extending 'driving shaft and provided With an apertured frame member spaced from said motor in the direction of said driving shaft, a compressor driven from said driving shaft, a condenser coil for receiving compressed fluid from said compressor and supported by said apertured frame member, a receiver for receiving condensed fluid from said condenser coil, and a fan on said driving shaft positioned in the space between said frame memberl and said motor and arranged to cause a floT of air through said aperturedframe member.

9. In apparatus of the nature of that herein described, in combination, a motor having a vertically extending driving shaft and provided With an apertured auxiliary frame member, a compressor driven from said driving shaft, a condenser coil for receiving compressed fluid from said compressor, a curved receiver for receiving condensed fluid from said condenser coil, said condenser coil and said receiver bein arranged substantially concentrically an being supported by said apertured frame member, and a fan driven by said motor and arranged to cause a flow of air through said apertured frame member.

10. In apparatus of the nature of that herein described, in combination, a main frame provided with a bearing at one end thereof, a prime mover mounted Within said main frame and having one end of its shaft rotatably supported in said end bearing, a secondary frame detachably secured to said main frame and having a bearing therein for supporting rotatably the other end of said prime mover shaft, compressing means driven by said prime mover, means for receiving Huid compressed by said compressing means and adapted, upon being cooled, to permit condensation of said compressed fluid therein, means for receiving condensed fluid from said last-mentioned means, one of said means being supported by said secondary frame, and means controlled by said prime mover for passing a cooling fluid in thermal contact with said condenser.

11. In apparatus of the nature of that herein described, in combination, a main frame provided with a bearing at one end thereof, a prime mover mounted within said main frame and having one end of its shaft rotatably supported in said end bearing, a secondary frame detachably secured to said main frame and having a bearing therein for supporting rotatably the other end of said prime mover shaft, compressing means driven by said prime mover, means for receiving fluid compressed by said compressin g means and adapted, upon being cooled, to permit condensation of said compressed fluid therein, means for receiving condensed fluid from said last-mentioned means, at least two of said means being supported by said secondary frame, ,and means effective when said prime mover is operating for passing a cooling fluid in thermal contact with said condenser.

12. In apparatus of the nature of that herein described, in combination, a main frame provided with a bearing at one end thereof, a prime mover mounted Within said l\main frame and having one end of its shaft `rotatably supported in said end bearing, a secondary frame detacha'bly secured to said main frame and having a bearing therein for supporting rotatably the other end of said prime mover shaft, compressing means driven by said prime mover, means for receiving fluid compressed by said compressing means and adapted, upon being cooled,

to permit condensation of said compressed fluid therein, means for receiving condensed fluid from said last-mentioned means, one of' said means being supported by said secondary frame, andla fan on said prime mover shaft and intermediate of the bearings thereof for passing a current of air in thermal contact with said condenser.

13. In apparatus of the nature of that herein described, in combination,` a main frame having mounted therein' a prime mover havinnr a driving shaft, a secondary frame detacIlably secured to said main frame, a compressor supported by said detachable secondary frame and having means forming a detachable connection between its shaft and the prime mover shaft, means for receiving fluid compressed by said compressor and adapted upon being cooledt-o permit condensation of said compressed fluid therein, means for receiving condensed fluid from said last-mentioned means, one of said means being supported by said detachable secondary frame, and a fan driven by said prime mover for passing a current of' air in thermal contact with said. condenser.

14. In apparatus of the nature of' that herein described, in combination, a main frame having mounted therein a prime mover having a driving shaft, a secondary frame detachably secured to said main yframe and supporting a compressor, the

frame, means for receivinor fiuid compressed by sald compressor and adapted upon being cooled to permit condensation of said compressed fluid therein, `means for receiving condensed fiuidl from said last-mentioned means, one of said means being supported by said secondary frame, and means for` passing a cooling fluid in thermal contact with said condensing means.

l5. ln apparatus of the nature of that herein described, in combination, means adapted to hold a liquefied fluid, a heat-abstracting device, a pipe forming a connection therebetween, and expansion means comprising a plurality of serially arranged individual expansion units inserted directly in said pipe, each unit comprising an end wall portion havinv an expansion orifice therein and a su. stantially cylindrical chamber-forming portion integrally formed with said end wall portion and extended in a direction away from said end wall portion.

In testimony whereof', I have signed my name to this specification this 30th day of January, 1922.

GEORGE E. HULSE. 

